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Self-assembled monolayers of O-(2-Mercaptoethyl)-O′-methyl-hexa(ethylene glycol) (EG7-SAM) on gold electrodes. Effects of the nature of solution/electrolyte on formation and electron transfer blocking characteristics. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Grzelak D, Szustakiewicz P, Tollan C, Raj S, Král P, Lewandowski W, Liz-Marzán LM. In Situ Tracking of Colloidally Stable and Ordered Assemblies of Gold Nanorods. J Am Chem Soc 2020; 142:18814-18825. [PMID: 32990433 PMCID: PMC7645924 DOI: 10.1021/jacs.0c06446] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
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Solution-phase
self-assembly of anisotropic nanoparticles into
complex 2D and 3D assemblies is one of the most promising strategies
toward obtaining nanoparticle-based materials and devices with unique
optical properties at the macroscale. However, controlling this process
with single-particle precision is highly demanding, mostly due to
insufficient understanding of the self-assembly process at the nanoscale.
We report the use of in situ environmental scanning transmission electron
microscopy (WetSTEM), combined with UV/vis spectroscopy, small-angle
X-ray diffraction (SAXRD) and multiscale modeling, to draw a detailed
picture of the dynamics of vertically aligned assemblies of gold nanorods.
Detailed understanding of the self-assembly/disassembly mechanisms
is obtained from real-time observations, which provide direct evidence
of the colloidal stability of side-to-side nanorod clusters. Structural
details and the forces governing the disassembly process are revealed
with single particle resolution as well as in bulk samples, by combined
experimental and theoretical modeling. In particular, this study provides
unique information on the evolution of the orientational order of
nanorods within side-to-side 2D assemblies and shows that both electrostatic
(at the nanoscale) and thermal (in bulk) stimuli can be used to drive
the process. These results not only give insight into the interactions
between nanorods and the stability of their assemblies, thereby assisting
the design of ordered, anisotropic nanomaterials but also broaden
the available toolbox for in situ tracking of nanoparticle behavior
at the single-particle level.
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Affiliation(s)
- Dorota Grzelak
- Laboratory of organic nanomaterials and biomolecules, Faculty of Chemistry, University of Warsaw, Pasteura 1 st., Warsaw 02-093, Poland
| | - Piotr Szustakiewicz
- Laboratory of organic nanomaterials and biomolecules, Faculty of Chemistry, University of Warsaw, Pasteura 1 st., Warsaw 02-093, Poland
| | - Christopher Tollan
- Electron-Microscopy Laboratory, CIC nanoGUNE, Basque Research and Technology Alliance (BRTA), Tolosa Hiribidea 76, Donostia, San Sebastián 20018, Spain
| | - Sanoj Raj
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Petr Král
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States.,Department of Physics, Biopharmaceutical Sciences, and Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Wiktor Lewandowski
- Laboratory of organic nanomaterials and biomolecules, Faculty of Chemistry, University of Warsaw, Pasteura 1 st., Warsaw 02-093, Poland.,CIC biomaGUNE, Basque Research and Technology Alliance (BRTA) and CIBER-BBN, Paseo de Miramón 182, Donostia, San Sebastián 20014, Spain
| | - Luis M Liz-Marzán
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA) and CIBER-BBN, Paseo de Miramón 182, Donostia, San Sebastián 20014, Spain.,Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
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Chinwangso P, Lee HJ, Jamison AC, Marquez MD, Park CS, Lee TR. Structure, Wettability, and Thermal Stability of Organic Thin-Films on Gold Generated from the Molecular Self-Assembly of Unsymmetrical Oligo(ethylene glycol) Spiroalkanedithiols. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1751-1762. [PMID: 28107018 DOI: 10.1021/acs.langmuir.6b03803] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Organic thin-films on gold were prepared from a set of new, custom-designed bidentate alkanethiols possessing a mixture of normal alkane and methoxy-terminated tri(ethylene glycol) chains. The new unsymmetrical spiroalkanedithiol adsorbates were of the form [CH3O(CH2CH2O)3(CH2)5]-[CH3(CH2)n+1]C[CH2SH]2 where n = 3 and 14; designated EG3C7-C7 and EG3C7-C18, respectively. Their corresponding self-assembled monolayers (SAMs) on gold were characterized and compared with monothiol SAMs derived from an analogous normal alkanethiol (C18SH) and an alkanethiol terminated with an oligo(ethylene glycol) (OEG) moiety (i.e., EG3C7SH). Ellipsometric data revealed reduced film thicknesses for the double-chained dithiolate SAMs, which perhaps arose from the phase-incompatible merger of a hydrocarbon chain with an OEG moiety, contributing to disorder in the films and/or an increase in chain tilt. The comparable wettabilities of the SAMs derived from EG3C7SH and EG3C7-C7, using water as the contacting liquid, are consistent with exposure of the OEG moieties at both interfaces, whereas the lower wettability of the SAM derived from EG3C7-C18 is consistent with exposure of hydrocarbon chains at the interface. The data collected by X-ray photoelectron spectroscopy confirmed the formation of the new OEG-terminated dithiolate SAMs, and also revealed them as less densely packed monolayers due in part to the large molecular cross section of the OEG moieties and to their double-chained structure with dual surface bonds. Mixed SAMs formed from pairs of monothiols having chain compositions analogous to those of the chains of the new dithiols showed that an EG3C7SH/heptanethiol-mixed SAM and the EG3C7-C7 SAM produced almost identical characterization data, revealing the favorable film formation dynamics for adsorbate structures where the alkyl chains can assemble beneath the phase-incompatible OEG termini. For the mixed SAM formed from EG3C7SH/C18SH, the data indicate that the EG3C7SH component failed to incorporate in the film, demonstrating that the blending of phase-incompatible chains is sometimes best accomplished when both chains exist on a single adsorbate structure. Furthermore, the results of solution-phase thermal desorption tests revealed that the OEG-terminated films generated from the bidentate EG3C7-C7 and EG3C7-C18 adsorbates exhibit enhanced thermal stability when compared to the film generated from monodentate EG3C7SH. In a brief study of protein adsorption, the multicomponent SAMs showed a greater ability to resist the adsorption of fibrinogen on their surfaces when compared to the SAM derived from C18SH, but not better than the monolayer derived from EG3C7SH.
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Affiliation(s)
- Pawilai Chinwangso
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston , 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | - Han Ju Lee
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston , 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | - Andrew C Jamison
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston , 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | - Maria D Marquez
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston , 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | - Chul Soon Park
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston , 4800 Calhoun Road, Houston, Texas 77204-5003, United States
| | - T Randall Lee
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston , 4800 Calhoun Road, Houston, Texas 77204-5003, United States
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Cao HH, Nakatsuka N, Serino AC, Liao WS, Cheunkar S, Yang H, Weiss PS, Andrews AM. Controlled DNA Patterning by Chemical Lift-Off Lithography: Matrix Matters. ACS NANO 2015; 9:11439-54. [PMID: 26426585 DOI: 10.1021/acsnano.5b05546] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Nucleotide arrays require controlled surface densities and minimal nucleotide-substrate interactions to enable highly specific and efficient recognition by corresponding targets. We investigated chemical lift-off lithography with hydroxyl- and oligo(ethylene glycol)-terminated alkanethiol self-assembled monolayers as a means to produce substrates optimized for tethered DNA insertion into post-lift-off regions. Residual alkanethiols in the patterned regions after lift-off lithography enabled the formation of patterned DNA monolayers that favored hybridization with target DNA. Nucleotide densities were tunable by altering surface chemistries and alkanethiol ratios prior to lift-off. Lithography-induced conformational changes in oligo(ethylene glycol)-terminated monolayers hindered nucleotide insertion but could be used to advantage via mixed monolayers or double-lift-off lithography. Compared to thiolated DNA self-assembly alone or with alkanethiol backfilling, preparation of functional nucleotide arrays by chemical lift-off lithography enables superior hybridization efficiency and tunability.
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Affiliation(s)
- Huan H Cao
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Nako Nakatsuka
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Andrew C Serino
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Wei-Ssu Liao
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Sarawut Cheunkar
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Hongyan Yang
- Department of Psychiatry and Biobehavioral Health, Semel Institute for Neuroscience and Human Behavior, and Hatos Center for Neuropharmacology, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Paul S Weiss
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Anne M Andrews
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
- Department of Psychiatry and Biobehavioral Health, Semel Institute for Neuroscience and Human Behavior, and Hatos Center for Neuropharmacology, University of California, Los Angeles , Los Angeles, California 90095, United States
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Schuster S, Yu W, Nega M, Chu YY, Zorn S, Zhang F, Götz F, Schreiber F. The role of serum proteins in Staphylococcus aureus adhesion to ethylene glycol coated surfaces. Int J Med Microbiol 2014; 304:949-57. [DOI: 10.1016/j.ijmm.2014.05.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 03/24/2014] [Accepted: 05/31/2014] [Indexed: 01/22/2023] Open
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Inada N, Asakawa H, Matsumoto Y, Fukuma T. Molecular-scale surface structures of oligo(ethylene glycol)-terminated self-assembled monolayers investigated by frequency modulation atomic force microscopy in aqueous solution. NANOTECHNOLOGY 2014; 25:305602. [PMID: 25008429 DOI: 10.1088/0957-4484/25/30/305602] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The structure and protein resistance of oligo(ethylene glycol)-terminated self-assembled monolayers (OEG-SAMs) have been studied intensively using various techniques. However, their molecular-scale surface structures have not been well understood. In this study, we performed molecular-resolution imaging of OH-terminated SAMs (OH-SAMs) and hexa(ethylene glycol) SAMs (EG(6)OH-SAMs) formed on a Au(111) surface in an aqueous solution by frequency modulation atomic force microscopy (FM-AFM). The results show that most of the ethylene glycol (EG) chains in an EG(6)OH-SAM are closely packed and well-ordered to present a molecularly flat surface even in an aqueous solution. In addition, we found that EG(6)OH-SAMs have nanoscale defects, where molecules take a disordered arrangement with their molecular axes parallel to the substrate surface. We also found that the domain size (50-200 nm) of an EG(6)OH-SAM is much larger than that of OH-SAMs (10-40 nm). These findings should significantly advance molecular-scale understanding about the surface structure of OEG-SAMs.
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Affiliation(s)
- N Inada
- Division of Electrical Engineering and Computer Science, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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Schollbach M, Zhang F, Roosen-Runge F, Skoda MWA, Jacobs RMJ, Schreiber F. Gold nanoparticles decorated with oligo(ethylene glycol) thiols: surface charges and interactions with proteins in solution. J Colloid Interface Sci 2014; 426:31-8. [PMID: 24863761 DOI: 10.1016/j.jcis.2014.03.052] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 03/24/2014] [Accepted: 03/25/2014] [Indexed: 11/30/2022]
Abstract
We have studied oligo(ethylene glycol) (OEG) thiol self-assembled monolayer (SAM) coated gold nanoparticles (AuOEG) and their interactions with proteins in solutions using electrophoretic and dynamic light scattering (ELS and DLS). The results are compared with poly(ethylene glycol) (PEG) thiol coated AuNPs (AuPEG). We show that both AuOEG and AuPEG particles carry a low net negative charge and are very stable (remaining so for more than one year), but long-term aging or dialysis can reduce the stability. If the decorated AuNPs are mixed with bovine serum albumin (BSA), both effective size and zeta-potential of the AuNPs remain unchanged, indicating no adsorption of BSA to the colloid surface. However, when mixed with lysozyme, zeta-potential values increase with protein concentrations and lead to a charge inversion, indicating adsorption of lysozyme to the colloid surface. The colloidal solutions of AuOEG become unstable near zero charge, indicated by a cluster peak in the DLS measurements. The AuPEG solutions show similar charge inversion upon addition of lysozyme, but the solutions are stable under all experimental conditions, presumably because of the strong steric effect of PEG. Washing the protein bound colloids by centrifugation can remove only part of the adsorbed lysozyme molecules indicating that a few proteins adsorb strongly to the colloids. The effective charge inversion and rather strongly bound lysozyme on the colloid surface may suggest that in addition to the charges formed at the SAM-water interface, there are defects on the surface of the colloid, which are accessible to the proteins. The results of this study of surface charge, and stability shed light on the interaction with proteins of SAM coated AuNPs and their applications.
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Affiliation(s)
- Moritz Schollbach
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, D-72076 Tübingen, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, D-72076 Tübingen, Germany.
| | - Felix Roosen-Runge
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, D-72076 Tübingen, Germany
| | - Maximilian W A Skoda
- STFC, ISIS, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0OX, United Kingdom
| | - Robert M J Jacobs
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road OX1 3TA, United Kingdom
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, D-72076 Tübingen, Germany
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Matsumoto M, Matsusaki M, Akashi M. Safe Control of Construction–Deconstruction of High-density PEG Brushes on the Surface of Peptide Nanospheres by Thermally Induced Shrinkage of PEG–SS–PEG. CHEM LETT 2013. [DOI: 10.1246/cl.121236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masahiro Matsumoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Michiya Matsusaki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Mitsuru Akashi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
- CREST, Japan Science and Technology Agency
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